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| author | Xufeng Zhang <xufeng.zhang@windriver.com> | 2011-06-21 10:43:40 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-06-21 22:34:27 -0700 |
| commit | 9cfaa8def1c795a512bc04f2aec333b03724ca2e (patch) | |
| tree | 2c4bff0afe8424472b780a65a8d356db2d62caf4 /net | |
| parent | 32c90254ed4a0c698caa0794ebb4de63fcc69631 (diff) | |
| download | linux-9cfaa8def1c795a512bc04f2aec333b03724ca2e.tar.gz linux-9cfaa8def1c795a512bc04f2aec333b03724ca2e.tar.bz2 linux-9cfaa8def1c795a512bc04f2aec333b03724ca2e.zip | |
udp/recvmsg: Clear MSG_TRUNC flag when starting over for a new packet
Consider this scenario: When the size of the first received udp packet
is bigger than the receive buffer, MSG_TRUNC bit is set in msg->msg_flags.
However, if checksum error happens and this is a blocking socket, it will
goto try_again loop to receive the next packet. But if the size of the
next udp packet is smaller than receive buffer, MSG_TRUNC flag should not
be set, but because MSG_TRUNC bit is not cleared in msg->msg_flags before
receive the next packet, MSG_TRUNC is still set, which is wrong.
Fix this problem by clearing MSG_TRUNC flag when starting over for a
new packet.
Signed-off-by: Xufeng Zhang <xufeng.zhang@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/udp.c | 3 | ||||
| -rw-r--r-- | net/ipv6/udp.c | 3 |
2 files changed, 6 insertions, 0 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index abca870d8ff6..48cd88e62553 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1249,6 +1249,9 @@ csum_copy_err: if (noblock) return -EAGAIN; + + /* starting over for a new packet */ + msg->msg_flags &= ~MSG_TRUNC; goto try_again; } diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 1e7a43f500ab..328985c40883 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -455,6 +455,9 @@ csum_copy_err: if (noblock) return -EAGAIN; + + /* starting over for a new packet */ + msg->msg_flags &= ~MSG_TRUNC; goto try_again; } |